[libxslt/distutils: 1/2] python: Add a distutils build system

[Chun-wei Fan <fanchunwei src gnome org>]

commit 379773594db708e8f88eb09cbc9693c4887ad229
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Mar 9 16:43:26 2022 +0800

    python: Add a distutils build system
    
    Add a template setup.py.in which will be used by the win32 Makefiles so that we
    can generate the full setup.py which can be used to build the libxslt Python
    bindings, if chosen to do so when configuring via 'cscript configure.js'.

 python/Makefile.am |   1 +
 python/setup.py.in | 195 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 196 insertions(+)
---
diff --git a/python/Makefile.am b/python/Makefile.am
index 17a0d17c..61898d1b 100644
--- a/python/Makefile.am
+++ b/python/Makefile.am
@@ -17,6 +17,7 @@ EXTRA_DIST =                  \
        libxslt_wrap.h          \
        libxsl.py               \
        libxslt-python-api.xml  \
+       setup.py.in     \
        $(DOCS)
 
 libxsltmod_la_LDFLAGS =  -module -avoid-version
diff --git a/python/setup.py.in b/python/setup.py.in
new file mode 100644
index 00000000..028b38ab
--- /dev/null
+++ b/python/setup.py.in
@@ -0,0 +1,195 @@
+#!/usr/bin/python -u
+#
+# Setup script for libxml2 and libxslt if found
+#
+import sys, os, subprocess
+
+try:
+    import setuptools
+except ImportError:
+    pass
+
+from distutils.core import setup, Extension
+
+# Below ROOT, we expect to find include, include/libxml2, lib and bin.
+# On *nix, it is not needed (but should not harm),
+# on Windows, it is set by configure.js.
+ROOT = r'@prefix@'
+
+# If this flag is set (windows only),
+# a private copy of the dlls are included in the package.
+# If this flag is not set, the libxml2 and libxslt
+# dlls must be found somewhere in the PATH at runtime.
+WITHDLLS = 1 and sys.platform.startswith('win')
+
+def missing(file):
+    if os.access(file, os.R_OK) == 0:
+        return 1
+    return 0
+
+try:
+    HOME = os.environ['HOME']
+except:
+    HOME="C:"
+
+if sys.platform.startswith('win'):
+    libraryPrefix = 'lib'
+    platformLibs = []
+else:
+    libraryPrefix = ''
+    platformLibs = ["m","z"]
+
+# those are examined to find
+# - libxslt/xsltconfig.h
+includes_dir = [
+"/usr/include",
+"/usr/local/include",
+"/opt/include",
+os.path.join(ROOT,'include'),
+HOME
+];
+
+# those are added in the linker search path for libraries
+libdirs = [
+os.path.join(ROOT,'lib'),
+]
+
+xslt_files = ["libxslt-api.xml", "libxslt-python-api.xml",
+             "libxslt.c", "libxsl.py", "libxslt_wrap.h",
+             "generator.py"]
+
+if WITHDLLS:
+    def altImport(s):
+        s = s.replace("import libxml2mod","from libxmlmods import libxml2mod")
+        s = s.replace("import libxsltmod","from libxsltmods import libxsltmod")
+        return s
+
+if missing("libxslt-py.c") or missing("libxslt.py"):
+    if missing("generator.py") or missing(os.path.join("..", "doc", "libxslt-api.xml")):
+        print("libxslt stub generator not found, libxslt not built")
+    else:
+        try:
+            subprocess.call([sys.executable,
+                            'generator.py',
+                            os.path.join('..', 'doc', 'libxslt-api.xml'),
+                            'libxslt-python-api.xml'
+                            ])
+        except:
+            print("failed to generate stubs for libxslt, aborting ...")
+            print(sys.exc_info()[0], sys.exc_info()[1])
+        else:
+            head = open("libxsl.py", "r")
+            generated = open("libxsltclass.py", "r")
+            result = open("libxslt.py", "w")
+            for line in head.readlines():
+                if WITHDLLS:
+                    result.write(altImport(line))
+                else:
+                    result.write(line)
+            for line in generated.readlines():
+                result.write(line)
+            head.close()
+            generated.close()
+            result.close()
+
+xml_includes=""
+for dir in includes_dir:
+    if not missing(dir + "/libxml2/libxml/tree.h"):
+        xml_includes=dir + "/libxml2"
+        break;
+
+if xml_includes == "":
+    print("failed to find headers for libxml2: update includes_dir")
+    sys.exit(1)
+
+xslt_includes=""
+for dir in includes_dir:
+    if not missing(dir + "/libxslt/xsltconfig.h"):
+        xslt_includes=dir + "/libxslt"
+        break;
+
+if xslt_includes == "":
+    print("failed to find headers for libxslt: update includes_dir")
+
+if WITHDLLS:
+    # libxslt dlls (expected in ROOT/bin)
+    dlls = ['libxslt.dll','libexslt.dll']
+
+    packaged_dlls = [os.path.join(ROOT,'bin',dll) for dll in dlls]
+
+    # create __init__.py for the libxsltmods package
+    if not os.path.exists("libxsltmods"):
+        os.mkdir("libxsltmods")
+        open("libxsltmods/__init__.py","w").close()
+
+    packaged_dlls = [os.path.join(ROOT,'bin',dll) for dll in dlls]
+
+descr = "libxslt package"
+modules = [ 'libxslt']
+if WITHDLLS:
+    modules.append('libxsltmods.__init__')
+c_files = []
+includes= [xslt_includes, xml_includes]
+libs    = platformLibs
+macros  = []
+
+descr = "libxslt package"
+if not sys.platform.startswith('win'):
+    #
+    # We are gonna build 2 identical shared libs with merge initializing
+    # both libxml2mod and libxsltmod
+    #
+    c_files = c_files + ['libxslt-py.c', 'libxslt.c']
+    xslt_c_files = c_files
+else:
+    #
+    # On windows the MERGED_MODULE option is not needed
+    # (and does not work)
+    #
+    xslt_c_files = ['libxslt-py.c', 'libxslt.c', 'types.c']
+libs.insert(0, libraryPrefix + 'exslt')
+libs.insert(0, libraryPrefix + 'xslt')
+libs.insert(0, libraryPrefix + 'xml2')
+includes.append(xslt_includes)
+
+
+extens=[Extension('libxsltmod', xslt_c_files, include_dirs=includes,
+                        library_dirs=libdirs,
+                        libraries=libs, define_macros=macros)]
+
+if missing("MANIFEST"):
+
+    manifest = open("MANIFEST", "w")
+    manifest.write("setup.py\n")
+    for file in xslt_files:
+        manifest.write(file + "\n")
+    manifest.close()
+
+if WITHDLLS:
+    ext_package = "libxsltmods"
+    if sys.version >= "2.2":
+        base = "lib/site-packages/"
+    else:
+        base = ""
+    data_files = [(base+"libxsltmods",packaged_dlls)]
+else:
+    ext_package = None
+    data_files = []
+
+setup (name = "libxslt-python",
+       # On *nix, the version number is created from setup.py.in
+       # On windows, it is set by configure.js
+       version = "@VERSION@",
+       description = descr,
+       author = "Daniel Veillard",
+       author_email = "veillard redhat com",
+       url = "https://gitlab.gnome.org/GNOME/libxslt";,
+       licence="MIT Licence",
+       py_modules=modules,
+       ext_modules=extens,
+       ext_package=ext_package,
+       data_files=data_files,
+       )
+
+sys.exit(0)
+